msdkdec: force the alignment of width/height to 16 for vp8/vp9

MSDK library requires 16 alignment for vp8/vp9, otherwise a pipeline
for vp8/vp9 decoding might fail.

example pipeline:
gst-launch-1.0 filesrc location=vp8_1280x720.webm ! matroskademux ! \
msdkvp8dec ! fakesink

0:00:00.150565444 10657 0x55c8484036d0 ERROR                msdkdec
gstmsdkdec.c:1056:gst_msdkdec_handle_frame:<msdkvp8dec0>
DecodeFrameAsync failed (invalid video parameters)

sys/msdk/gstmsdkdec.c

@@ -263,6 +263,7 @@ gst_msdkdec_set_context (GstElement * element, GstContext * context)
 static gboolean
 gst_msdkdec_init_decoder (GstMsdkDec * thiz)
 {
+  GstMsdkDecClass *klass = GST_MSDKDEC_GET_CLASS (thiz);
   GstVideoInfo *info;
   mfxSession session;
   mfxStatus status;
@@ -300,13 +301,8 @@ gst_msdkdec_init_decoder (GstMsdkDec * thiz)
   g_return_val_if_fail (thiz->param.mfx.FrameInfo.Width
       && thiz->param.mfx.FrameInfo.Height, FALSE);
 
-  /* Force 32 bit rounding to avoid messing up of memory alignment when
+  klass->preinit_decoder (thiz);
-   * dealing with different allocators */
+
-  /* Fixme: msdk sometimes only requires 16 bit rounding, optimization possible */
-  thiz->param.mfx.FrameInfo.Width =
-      GST_ROUND_UP_16 (thiz->param.mfx.FrameInfo.Width);
-  thiz->param.mfx.FrameInfo.Height =
-      GST_ROUND_UP_32 (thiz->param.mfx.FrameInfo.Height);
   /* Set framerate only if provided.
    * If not, framerate will be assumed inside the driver.
    * Also we respect the upstream provided fps values */
@@ -1449,6 +1445,17 @@ gst_msdkdec_finalize (GObject * object)
   g_object_unref (thiz->adapter);
 }
 
+static gboolean
+gst_msdkdec_preinit_decoder (GstMsdkDec * decoder)
+{
+  decoder->param.mfx.FrameInfo.Width =
+      GST_ROUND_UP_16 (decoder->param.mfx.FrameInfo.Width);
+  decoder->param.mfx.FrameInfo.Height =
+      GST_ROUND_UP_32 (decoder->param.mfx.FrameInfo.Height);
+
+  return TRUE;
+}
+
 static void
 gst_msdkdec_class_init (GstMsdkDecClass * klass)
 {
@@ -1477,6 +1484,8 @@ gst_msdkdec_class_init (GstMsdkDecClass * klass)
   decoder_class->flush = GST_DEBUG_FUNCPTR (gst_msdkdec_flush);
   decoder_class->drain = GST_DEBUG_FUNCPTR (gst_msdkdec_drain);
 
+  klass->preinit_decoder = GST_DEBUG_FUNCPTR (gst_msdkdec_preinit_decoder);
+
   g_object_class_install_property (gobject_class, GST_MSDKDEC_PROP_HARDWARE,
       g_param_spec_boolean ("hardware", "Hardware", "Enable hardware decoders",
           PROP_HARDWARE_DEFAULT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

sys/msdk/gstmsdkdec.h

@@ -107,6 +107,10 @@ struct _GstMsdkDecClass
   GstVideoDecoderClass parent_class;
 
   gboolean (*configure) (GstMsdkDec * decoder);
+
+  /* reset mfx parameters per codec, currently it is only used for
+   * the alignment exception for frame width and height */
+  gboolean (*preinit_decoder) (GstMsdkDec * decoder);
 };
 
 struct _MsdkDecTask

sys/msdk/gstmsdkvp8dec.c

@@ -132,6 +132,17 @@ gst_msdkdec_vp8_get_property (GObject * object, guint prop_id, GValue * value,
   GST_OBJECT_UNLOCK (thiz);
 }
 
+static gboolean
+gst_msdkvp8dec_preinit_decoder (GstMsdkDec * decoder)
+{
+  decoder->param.mfx.FrameInfo.Width =
+      GST_ROUND_UP_16 (decoder->param.mfx.FrameInfo.Width);
+  decoder->param.mfx.FrameInfo.Height =
+      GST_ROUND_UP_16 (decoder->param.mfx.FrameInfo.Height);
+
+  return TRUE;
+}
+
 static void
 gst_msdkvp8dec_class_init (GstMsdkVP8DecClass * klass)
 {
@@ -147,6 +158,8 @@ gst_msdkvp8dec_class_init (GstMsdkVP8DecClass * klass)
   gobject_class->get_property = gst_msdkdec_vp8_get_property;
 
   decoder_class->configure = GST_DEBUG_FUNCPTR (gst_msdkvp8dec_configure);
+  decoder_class->preinit_decoder =
+      GST_DEBUG_FUNCPTR (gst_msdkvp8dec_preinit_decoder);
 
   gst_element_class_set_static_metadata (element_class,
       "Intel MSDK VP8 decoder",

sys/msdk/gstmsdkvp9dec.c

@@ -148,6 +148,17 @@ gst_msdkdec_vp9_get_property (GObject * object, guint prop_id, GValue * value,
   GST_OBJECT_UNLOCK (thiz);
 }
 
+static gboolean
+gst_msdkvp9dec_preinit_decoder (GstMsdkDec * decoder)
+{
+  decoder->param.mfx.FrameInfo.Width =
+      GST_ROUND_UP_16 (decoder->param.mfx.FrameInfo.Width);
+  decoder->param.mfx.FrameInfo.Height =
+      GST_ROUND_UP_16 (decoder->param.mfx.FrameInfo.Height);
+
+  return TRUE;
+}
+
 static void
 gst_msdkvp9dec_class_init (GstMsdkVP9DecClass * klass)
 {
@@ -163,6 +174,8 @@ gst_msdkvp9dec_class_init (GstMsdkVP9DecClass * klass)
   gobject_class->get_property = gst_msdkdec_vp9_get_property;
 
   decoder_class->configure = GST_DEBUG_FUNCPTR (gst_msdkvp9dec_configure);
+  decoder_class->preinit_decoder =
+      GST_DEBUG_FUNCPTR (gst_msdkvp9dec_preinit_decoder);
 
   gst_element_class_set_static_metadata (element_class,
       "Intel MSDK VP9 decoder",